This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 5 |
| 8 | 9 |
| 9 | 17 |
| 10 | 33 |
| 11 | 63 |
| 12 | 126 |
| 13 | 254 |
| 14 | 511 |
| 15 | 1039 |
| 16 | 2124 |
| 17 | 4371 |
| 18 | 9059 |
| 19 | 18839 |
| 20 | 39339 |
| 21 | 82385 |
| 22 | 173111 |
| 23 | 364829 |
| 24 | 771010 |
| 25 | 1633313 |